Had Bernie Sanders gotten the nomination, he would have beat Trump. The fact that the Dems rigged the process to get Clinton the nomination shows that those who buy up both sides of the aisle wanted Trump to win. Otherwise, you can't really explain the Dems ticking off their base to put Clinton on the ticket. Clinton, after all, is Republican lite -- not really a liberal. She was a Goldwater girl back when being uber liberal was actually cool. That says all you need to know about how "liberal" she really is.
Bernie Sanders is too old now, though. And there is no chance he'll get the nomination anyway. It is clear from the media narrative that Biden is the #1 pick. Biden is also too old and he has the whole "creepy Uncle Joe" thing which is honestly valid and should be reason enough for the Dems to kick him to the curb. Back up plan seems to be Kamala Harris. Better than Biden, but still not someone I'd pick. If they pick Biden, though, there is no way I'd cast a vote for them. I'll vote 3rd party again.
I'd actually be shocked if Trump didn't win re-election. I'm convinced that those with deep pockets who buy up both sides of the aisle actually love Trump and want him right where he is because he has been able to deliver everything that they want and there doesn't seem to be anything that he can do that will cause enough of a backlash to pose an impeachment threat. Just like with GW Bush, they have the whole "idiot president" narrative that they can run with so that you think all these "screw ups" are just Trump being stupid when in reality he is doing exactly what they want. All I know is that they must have some pretty good dirt on him to get him to so easily agree to what they want, even stuff that is actually against the interests of the US -- like working on starting a war with Iran which Trump is pushing despite the fact that it risks starting WW3 to do so. And since we already know about the playboy playmates, the grabbing women by the pu$$y thing, the alleged r*pe of a 13 year old whom he told reminded him of his daughter, and the golden showers -- it has got to be bad. If that is not the worst of it, I shudder to think what that man has been involved in.
The only person who doesn't have a chance to beat Trump is Biden, which is why it is pretty much guaranteed he will get the nomination. Their strategy seems to involve moving to right in order to win those elusive "undecided" and "moderate" voters rather than motivating their base (who reliably get out and vote) with a candidate they can enthusiastically support. Already the Dems of today are the political equivalent of the Repubs of my youth. The Repubs have veered so far to the right that they are pretty much knocking on the door of fascism. So, we aren't going to be getting any liberal Presidents ever. Not by voting Democratic, anyway.